Sclerotinia sclerotiorum is one of the important diseases in the production of rapeseed, which will cause a reduction in production in severe cases. So, how should rapeseed sclerotinia disease be prevented?
The following five methods can effectively prevent and cure Sclerotinia sclerotiorum, improve the quality of rapeseed, and increase the yield of rapeseed.
First, the rainwater in the clear ditch is increased, the rapeseed field is susceptible to waterlogging, and the respiration and absorption capacity of the rapeseed roots are affected, but the rotten roots of the rapeseed are damaged, which affects the yield, and the disease is popular due to the high humidity in the field. It is necessary to clear the ditch early.
Second, the cultivating loose soil in the rape buds to the flowering period of cultivating can cut off the ascospores produced by the sclerotia, which has a significant effect on reducing the occurrence of diseases, and can also control the weeds of the weeds and improve the permeability of the upper soil.
Third, timely old leaves in the rape flowering period to the final flowering period, timely removal of yellow, old, diseased leaves, in order to reduce the source of disease, improve the field ventilation and light conditions. The old leaves should be carried out after the dew on the sunny day, and the old leaves that are laid should be taken to the field for destruction.
Fourth, increase the application of potassium fertilizer to increase the application of potassium fertilizer to rapeseed in the spring, can enhance the disease resistance of the plant, in the late February to early March of the next year, the use of potassium chloride 5 ~ 6 kg, choose to apply the rape roots to the water in the sunny afternoon. It is also possible to spray a potassium dihydrogen phosphate solution from the bud to the flowering stage.
5. The main points of drug control are applied in susceptible fields, continuous cropping fields, low-lying fields, and rapeseed fields with excessive nitrogen fertilizers. In the field from the initial flowering stage to the full flowering stage, the diseased leaf rate is 8% to 10%, and the disease stem rate is 1%. The application is 40% of the carbendazim suspension, 150 grams of water, 50 to 75 kilograms of water, 7 Spray again 1 to 10 days. Spraying should be sprayed on the lower stems and leaves of the rapeseed to improve the control effect.
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